CODEWITHSUNDEEP
pythonnumpyimage-processingpython-imaging-library
somedude1234
somedude1234

Reputation: 55

Trying to turn all white areas in a grayscaled imaged to black

As the title says I'm trying to turn all the white parts in my grayscaled photo to black. I tried using this code right here 

img_file = os.path.join(img_dir, os.listdir(img_dir)[1])
img = Image.open(img_file).convert('L')

npImage = np.array(img)

LUT = np.zeros(256, dtype=np.uint8)
LUT[255] = 0

img = Image.fromarray(LUT[npImage])
img.show()

but my output is a purely black image.

Upvotes: 1

Views: 43

Answers (1)

Jake P
Jake P

Reputation: 480

LUT is an array of all 0s and 0's will display as black. What you want to do is create a for loop to access all of the values in npImage, and if necessary change to black.

LUT = np.zeros(256, dtype=np.uint8) creates an array of 0's of length 256

LUT[255] = 0 sets the 256th element in LUT to 0

Upvotes: 1

Related Questions